F4
Daewoo
Humidity Sensor Short / Open (Alternate Code)
Microwave displays F4 and stops heating
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open humidity sensor, Shorted humidity sensor, Damaged sensor harness, Faulty control PCB sensor circuit
How to Fix / Troubleshooting
Safety first: Disconnect power before removing covers.
Step-by-step:
- 1. Clean sensor area: Thoroughly clean the interior, especially near the humidity sensor opening, to remove grease and residue.
- 2. Access sensor: Remove the outer cabinet and locate the humidity sensor module near the top or side of the cavity.
- 3. Check connections: Ensure the sensor plug is fully seated on both the sensor and control board. Inspect for corrosion or broken wires.
- 4. Test sensor: If you have the service data, measure the sensor's resistance or voltage output as specified. Replace if readings are abnormal.
- 5. Replace control PCB if needed: If a new sensor does not resolve F4, the control board may be at fault.
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Repair Difficulty
Hard
4/5
Required Part
Humidity Sensor
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